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ultrasonic distance measurement


Posted Date: 27 Apr 2008    Resource Type: Articles/Knowledge Sharing    Category: Education
Posted By: C.Agnes       Member Level: Silver
Rating:     Points: 5



Block diagram of distance measurement:

Figure : Ultrasonic distance measurement
Distance meter block description:
This circuit is designed to measure the distance of the object with the help of ultrasonic waves. The 12F675 microcontroller is used to generate the 40 KHz frequency signal. This signal is given to level logic converter (MAX232) in order to convert to TTL output pulse to +12V and -12V pulse. Then this pulse is transmitted through ultrasonic transmitter.
The ultrasonic waves spread in the air and hit the nearest object and reflected. The reflected signal from the object is received by the ultrasonic receiver. The received wave is given to the amplifier in order to amplify the received weak signal. After amplification the amplified wave is given to zero adjustment amplifier because the amplified wave is in the range of above 6V level. Then the output is given to comparator in which the wave signal is converted into corresponding square wave signal. Then the square wave signal is given to input of the microcontroller. Now the microcontroller compares the time between the transmitted signal and received signal and generates the corresponding pulse output which is equal to distance of the object. Then the pulse signal is given to input of BC547 transistor.


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Author: swapnil    30 Apr 2008Member Level: Bronze   Points : 2
whr the hell is the diagram



Author: C.Agnes    20 May 2008Member Level: Silver   Points : 2
I have attached the ultrasonic distance meter diagram.


Author: Shyni     31 May 2008Member Level: Gold   Points : 2
This is great Information, Thanks for your effort to share it with everyone.


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